Machine for cutting and dressing stone



(No Model.) 2 SheetsSheen I2.

A. MGDONALD. MACHINE FOR CUTTING AND DRESSING STONE.

No. 473,850. PatentedApr. 26, 18912.

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rre, STATES ATENT Felon.

ALEXANDER MCDONALD, F CAMBRIDGE, MASSACHUSETTS.

v MACHINE FOR CUTTING AND DRESSING STONE.

SPECIFICATION forming part of Letters Patent No. 473,850, dated April 26, 1892. Application filed May 9, 1891. Serial No. 392,237. (No model.)

I of Cambridge, county of Middlesex, State of Massachusetts, have invented certain new and usefullmprovementsinlVIachineryforCutting and Dressing Stone, of which the following is a specification.

My invention embodies improvements on prior Letters Patent of the United States granted to me, numbered 222,194, 262,237, and 307,865, and relates to a device for cutting and dressing the top of a stone and cutting moldings in the stone, consisting in a rotary chuck adjustable to the inclination required to cut a desired molding, said chuck being provided with adjustable cutters free to turn in contact with the stone.

The invention relates, further, to adjustable telescopic braces provided to brace the plate carrying the stone-cutting chuck.

The invention relates, further, to an improved chuck simpler in construction, more compact, and cheaper to make than mechanism of this class shown and described in my said prior Letters Patent.

The invention relates, also, to a `device for cutting and dressing the side of a stone, consisting in two oppositely-rotating chucks with shafts in parallel bearings and provided with adjustable cutters free to turn in contact with the stone, the shaft of one of said chucks being so adjustable endwise in its bearings that this chuck may be advanced beyond the other chuck, it' desired, in order that the two chucks may cut the stone on parallel planes, and one of said chucks being adjustable concentrically with the other chuck, in order that when a stone thin in vertical section is to be cut the two chucks may act upon the stone to a common point, the one cutting up and the other down, to obviate the fault occasioned by a single chuck acting upon a thin stone of leaving the stone ragged at the edge opposite to the edge at which the cutters enter.

In the drawings, Figure l is a front elevation of the machine, showing both the topcutting and side-cutting devices. Fig. 2 is a horizontal section on the line x of Fig. l. Fig. 3 is a detail side elevation of the sidecutting device. Fig. 4 is a rear elevation of the side-cutting device, the driving-pulley removed. Fig. 5 is a vertical detail section on a of the device for cutting the top of the stone.

To the supporting-frame a', by means of the cross-bars d2, is attached the grooved guide b, within which is guided up and down the movable plate b', by means of the vertical shaft b3, worm b4, worin-wheel b5, horizontal shaft h6, pinion o7, and rack bs, attached to the movable plate b', the shaft b3 being operated by the belt b9 and pulley Z910 to raise and lower said movable plate. The movable plate b', when in` position, is braced by means of adj ustable telescopic braces pivotally attached at their opposite ends to the frame a and the movable plate b. These braces consist of a tubular portion c, pivotally attached to the frame at c', into which tubular portion passes the rod c2, as shown, pivoted at c3 to the movable plate b. The unpivoted end of the tubular portion c of the brace is provided with an internal clamping-plate c4 and a set-screw c5, whereby the rod c2 and the tubular portion c may be rigidly clamped together when the movable plate is in the desired position.

From the lower end of the movable plate b' is pivotally hung the chuck-carrying frame d on the shaft d2 and sleeve of the shaft d', mounted in the hangers b2 of the movable plate b', as shown. ing in the chuck-carrying frame cl, While the shaft d2 is rigidly attached to the chuck-carrying frame and is provided with the Wormwheel d3, operated by means of the worm d4, attached to the shaft d5, which is mounted in bearings in the hanger on the movable plate b', as shown, the shaft being operated by the handwheel d, The effect of turning the hand-wheel d is to swing the chuck-carrying frame d and its chuck and adjust the chuck to the desired inclination. Passing loosely through the circular slot CP2 in the chuckcarrying frame d and screwing into the hanger d2, as shown, is the rod d, which The shaft d has a bear- IOO VlO

has a bearing in the opposite hanger and is provided at its outer end with a hand-wheel (Z13 and at its clamping end with a fixed collar C114, whereby the frame and hanger may be firmly clamped together and securely hold the chuck at theinclination to which it is adj usted. Rotary motion is given to the chuck through its shaft d?, mounted in a bearing in the chuck-carrying frame d, as shown, by means of the bevel-gear d8, which meshes into the bevel-pinion d", mounted on the shaft el', provided with fast. and loose pulleys d10.

The adjustment above described of the chuck is obviously applicable to any rotary chuck provided with adjustable cutters rotating with the chuck, and also free to turn in contact with the stone, aswell as to my improved chuck, herein next described. y

To the lower end of the shaft Z7 is attached the rotary stone cutting or molding chuck, consisting, essentially, of the body portion e, the adjustable cutter-heads c', consisting of the head e and its arm e3, rigidly united, (in the drawings shown formed in one piece,) and the cutters c2. The body e of the chuck is provided with angular holes-in the drawings square holes are shown-within which are placed the arms e3 of the cutter-heads e'. In each cutter-head c is supported a cutter-spindle e4, which is free to turn in its bearing in the cutter-head and carries with it its cutter e2,'made fast to the spindle, as shown. Each spindle e4 is screw-threaded on its upper end and is there provided with a suitable nut and check-nut e, and a suitable washer e on the spindle eiis interposed between the cutter and cutterheads, and asuitable washer e7 is mounted upon a squared portion of the spindle between the cutter-head and nut and check-nut.

Each cutter-head is adjustable by means of set-screws c8,pas'sing through screw-threaded perforations inthe opposite si'de of one of the angular holes in the body of the chuck and bearing against the arm of the cutter-head, and by means of the set-screws e9, which pass through 'screw-threaded perforations in the outer side of the angular hole and bear against the arm of vthe cutter-head, and by placing a suitable wedge (not shown) between the arm and the inner surface of the angular hole, and each cutter-head is adjustable up and down by means of a nut elo, mounted upon the screw-threaded end of the arm e3 of thel cutter-head above the body of the chuck, and a nut or collar ell, mounted upon the screwthreaded portion of the cutter-head below the body of the chuck. A suitable washer or plate 812 on the arm e3 of the cutter-head is interposed between the nut @10 and the body of the chuck, whereby the cutters carried by the cutter-heads may be adjusted to the proper relative positions to cut in the same plane and on the same circumference, each arm e3 serving also to keep the axis of the cutter carried by the cutter-head united to such arm at an angle to the axis of the chuck, whereby,

in connection therewith of the proper adjusting devices, the cutter may be present-ed to the stone at a cutting-angle.

The chucks of the device for cutting the side of the stone, g and g may be of any suitable description of rotary chuck provided with adjustable cutters rotating with the chuck and also free to turn in contact with the stone, but, as shown,are each the same as the improved chuck already described, and therefore their separate parts are not lettered. In thedevice for cutting the side of the stone, f are the frames, in which is loosely mounted in fixed bearings the driving-shaft f', provided with a suitable fast and loose pulley f 2 and carrying the lower chuck g. To theshaft f is fixed the spur-gear f3, which meshes into the spur-gear h', mounted upon the shaft h, as shown. The Ashaft h has bearings within brackets h2. To one end of the shaft It is attached a chuck g. The brackets h2 are made adjustable upon a portion of the frames f, made concentric with the shaft f by means of' cap-screw bolts h3, passing through slots h4 in the brackets, and, with the brackets 712, the shaft h, and its chuck g', are adjustable concentrically with the shaft fr. The shaft h is provided 'with a collar h5 on each side lof the frame, as shown, which collar is 'provided with suitable set-sc rews h6 to set the collar upon the shaft, so as to admit of longitudinal 'adjustinent of the shaft and its vchuck'g" and to hold them in their adjusted position. The gear f3 may be made with sufiicient lbreadth efface to allow the gear h and with itM the chuck g and its shaft'to be adj usted lengthwise, as shown; but, if preferred, the gear h 'may be made adjustable upon the shaft h by means of a suitable set-screw on the' shaft (shown at hi) and a spline. (Not shown.)

The bed a of the machine is provided with tracks as, upon which is a movable table t'. The tablet'is provided with tracks t', arranged at right angles to the tracks a3, uponwhich is movableanother table le, upon' which lat- IOO ter table is mounted a turn-table Z, upon which the stone is placed, whereby the stone is moved, as required, in orderto be acted upon by the cutting devices.

I claim- I l. In a machine for cutting and dressing stone, a chuck provided with means to posi'- tively rotate it,`thereby positively rotating its cutters jointly, said chuck being adjustable, thereby adjusting its cutters jointly to the inclination required to outa desired molding by means adapted to swing said chuck, Vsubstantially as described, said cutters also beingl adjustable severally and severally free to turn in contact with the stone.

2. In a machine for cutting and dressing stone, the combination, with the movable plate lj', of a telescopic brace pivotally attached to the frame ctand to the m'ovable plate b', consisting of a rod c2, and a tubular portion c, provided with a clamping-plate'c and a set-screw c5 to rigidly clamp the rod and tubular portion together, substantially as described, for the purpose specified.

3. `In a stone-cutting chuck provided with means to positively rotate it, thereby positively rotating its cutters jointly, said cutters also being severally free to turn in contact with the stone,and a cutter-head provided with an arm rigidly united with it and adjustable by means of devices bearing upon said arm, said arm serving also to keep the aXis of the cutter carried by the cutter-head at an angle to the axis of the chuck, substantially as described.

4. In a machine for cutting and dressing stone, the combination of two chucks provided with means to positively rotate them oppo sitely, thereby positively rotating oppositely the cutters of each chuck jointly, one of said chucks being adjustable concentrically with the other chuck, thereby adjusting its cutters jointly and coucentrically With said other chuck, substantially as described, the cutters of both of said chucks also being adjustable severally and severally free to turn in contact lwith the stone.

stone.

ALEXANDER MoDONAlLD. Witnesses:

WALDRON BATES, WM. S. ROGERS. 

